Wrench



(INTTED STATES PATENT Ormea.,

HENRY A. OOOLIDGE, OF EAST JAFFREY, NEV HAMPSHIRE, ASSIGNOR OF ONE-HALF TO JOI-IN IV. COOLIDGE, OE HANCOCK, NEI/V HAMPSHIRE.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 562,329, dated une 16, 1896:.

Application filed February 19, 1896- Serial No. 579,839. (No model.) i

To @ZZ whom t may concern:

Be it known that I, HENRY A. COOLIDGE, of East Jaffrey, county of Cheshire,`and State of New Hampshire, have invented an Im- 5 provelnent in Wrenches for Bit-Braces, of

which the following description, in` connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

1o My invention has for its object to provide a wrench for use with the ordinary bit-brace, so as to enable the user to turn a nut with greater rapidity and power than is possible with the wrenches ordinarily in use.

i 5 This improvement also provides a bitwrench to accompany the ordinary kit of bits.

In the accompanying drawings, illustrative of my invention, Figure lis a front elevation of my improved bit-wrench with parts broken away to show details of construction. Fig.

2 is a side elevation of the same, looking toward the left at Fig. l; and Fig. 3 is a central vertical 'section of Fig. l on the line 3 3.

In the present embodiment of my invention, A designates the body portion of the wrench, which is provided at one end with a reduced shank d, terminating in a tapering end a, (shown in the present instance with a plurality of fiat faces adapting it for insertion within the socket of the ordinary bitbrace.) Within the body portion A, I have provided two oppositely-facing jaws B B', suitably recessed at their upper inner faces to provide a nut-socket C, terminating at its 3 5 lower end in suitable shoulders c for the purpose of limiting the entrance therein of the nut which is being turned.

In the present instance of my invention I have shown the jaws B B as operating together within the body portion A, they being hinged together at their lower portions by means of the bolt c', which is shown as projecting at either end to constitute guide-pins working in the guide-slots d d', formed therefor in the adjoining members of the body portion A. These jaws are normally maintained in retracted or closed position by means of a spring S, which abuts against the projecting end of the bolt c at one end and 5c is maintained in proper position at its other end by means of a pin s', the guide-slot d being extended to accommodate the spring S.

The jaws are moved against the tension of the spring S by means of a suitable thumbpiece E, (shown as fixed on one end of the bolt c'.) In the preferred embodiment of my invention, I provide abutting surfaces j', carried by the body portion A, for the outer angular faces of the jaws to move against, said surfaces being herein shown as formedin a disk- 6o shaped head F, angularly recessed to receive the outer'ends of the jaws, as shown in Fig. 3, said coperating angular portions. thereby receiving the twisting strains due to the operation of the wrench. The jaws are provided with cam-surfaces c2, held in constant engagement with said abutting surfaces j' by suitable means, herein shown as a spring s, retained in opposing pockets formed thereforA in the respective jaws. Stopstmay be 7o provided upon the jaws to abut against the head F and thereby limit the outward movement of said jaws.

In the use of myinvention, when it is desired to remove a nut, for instance, from a carriage-wheel, the securing end d of the shank of the wrench is firmly' inserted in a bit-brace, and the thumb is pressed against the thumb-piece E, thereby projecting the jaws B B, and at the same time, by reason Sc of the vspring s, opening the same to accommodate the particular-sized nut to be removed. Immediately upon removing the thumb from pushing engagement against the thumb-piece, the jaws, by reason of the spring 8 5 S, are automatically closed upon the nut through the cooperation of the cani-surfaces c2 with the abutting surfaces f.

I claimm l. A wrench, comprising a body portion, 9o provided at its outer end with a head angularly recessed, a plurality of jaws, hinged together at their inner ends, and angularly formed at their outer ends to reciprocate in and fit snugly against said angularly-recessed head,said cooperating angular portions thereby receiving the twisting strains due to the operation of the wrench, a stop formed on one of said jaws to abut against the under side of said head for limiting the outward Ioo movement of said jaws, and a spring` tending,` sion-spring` located in said body portion and to retract said jaws within said body, said bearing against said hinge-bolt between said spring` being held by said body in a slot projaws and said thumb-piece to retract said 15 vided therefor between said head and the jaws, substantially as described.

5 hinged end of said jaws, substantially as de- In testimony whereof I have signed my scribed. name to this specification in the presence of 2. A wrench, comprising a body portion, a two subscribing witnesses.

plurality of jaws, hinged together by means of a bolt at their lower ends, and arranged HENRY A. COOLIDGE. 1 o to reciprocate within said body portion, guides lVitnesses:

therefor to receive said hinge-bolt, a thumb- C. L. RICH,

piece on the end of said bolt, and a compres- LANA M. RICH. 

